import json

from oauthlib.common import to_unicode


def mailchimp_compliance_fix(session):

  def _null_scope(r):
    token = json.loads(r.text)
    if 'scope' in token and token['scope'] is None:
      token.pop('scope')
    r._content = to_unicode(json.dumps(token)).encode('utf-8')
    return r

  def _non_zero_expiration(r):
    token = json.loads(r.text)
    if 'expires_in' in token and token['expires_in'] == 0:
      token['expires_in'] = 3600
    r._content = to_unicode(json.dumps(token)).encode('utf-8')
    return r

  session.register_compliance_hook('access_token_response', _null_scope)
  session.register_compliance_hook('access_token_response',
                                   _non_zero_expiration)
  return session
